Pontiac Fiero 1988 Service Manual page 924

INTRODUCTION
SCHEMATICS
These schematics break the entire electrical
system down into individual circuits. You are
not distracted by wiring which is not part of
the circuit you 're working on.
It is important to realize that no attempt is
made on the schematic to represent compo-
nents and wiring as they physically appear on
the car. For example, a 4-foot length of wire is
treated no differently in a schematic from one
which is only a few inches long. The number of
cavities for each connector is listed in the Com-
ponent Location List. Similarly, switches and
other components are shown as simply as pos-
sible, with regard to function only.
The following example shows how to read a
Horn schematic, see figure 1. Locate the Horn
schematic using the Index. The circuit sche-
matic will look somewhat like the one to the
right. The schematic is read from top to bot-
tom.
Voltage is applied to the Horn Relay at all
times. When the relay coil is grounded by clos-
ing the Horn Switch, the relay contacts close.
When the relay contacts are closed, both the
LH and RH Horns are energized.
HORN
H O T A T A L L T I M E S
SEE GROUND
DISTRIBUTION
Figure 1 - Typical Horn Schematic